Trimming and perforating die



April 2, 1940. .F.. G. KuRTzEBoRN I THINKING' .AND PERFORTING DIE AFiled July 12, lass 2 sheets-sheet 1 flip um April 2,1940- F, G. KuRTzEBoRN 2,195,819

` TRIMMING AND PERFORMING DIE Filed July l2, 1939 2 ShQetS-Sheet 2 Patented Apr. 2, 1940 UNITED STATES PATENT oil-FICE vFrederick GfKurtze'born, St. Louis, Mo. Applieation July 12, 1939, rserial No. `283.999

ioolaims. (o1. 164-29) ,l l

l Figure 3 is an enlarged cross section taken on This invention relates to a trimming and perforating die forleather and other material. l

Heretofore, dies used for trimming and perforating shoe uppers or other shoe parts con'- sisted of a `base to which wassecured the cutting blade or perforating elements. A steel mask or plate Was supported on said base by coiled springs with its uppery face normally a slight distance above the upwardly presented edge of the blade or `other die element The blade had to be madel on a router machine and was consequently expensive to make". The base, mask, and A gauge had to be constructed as a single unit and were not separable from each other.

' Among the objects of the present invention is the provision of a trimming or perforating die in which the base or sliding plate carrying the base and gauge is formed detachable from these elements and can be used' interchangeably with other die units, whereby only a single sliding plate is necessary. i

Another object of the invention is to provide a trimming or perforating die unit comprising a base formed of plywood,'ber or other suitable non-metallic material, a trimming or perforating die element xed in said base and projecting. upwardly thereabove, and a rubber stripper fastened to the upper face of said base and forming a support for vthe work to 'be operated upon;

Another object of the invention is to provide a die unit including a base' and a rubber stripper, anda gauge removably `and slidably positioned in said base, whereby said gauge is interchangeable with other gauges or can be made reversible.

Another vobject of the invention is to provide a trimming die in which the die element is formed of one or morestrips of steel having a cutting edge, said strip being bent into the desired shape.

Additional objects of the invention are to provide a trimmingfand/or perforating die which is inexpensive to manufacture, is light in weight, can be easily handled, has interchangeable parts, and ishighly eicient in performing its intended functions. f y

With these and other objects in View, my invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the'accompanying drawings, vin which- Figure 1 isa top plan view of a die withl parts partly broken away. v

Figure 2 is an enlargedvertical cross section taken on line 2-2 of Figure 1. y

line 3-3 ofFigure 1.

Figure 4 -is an enlarged cross'section taken on line 4 4 of Figure 1.

Figure 5 is an enlarged cross section takenon line 5-5 of Figure 1.

Figure 6 is a detail cross sectie-n showing the die in the press with the movable member thereof in downward position.

Figure 7 is a top plan view of a modied form of a gauge.

, Figure 8 is a vtop plan View of amodied form of a die. l. y

Figure 9 is a horizontal cross section through the same. i

Figure 10 is an enlarged cross section taken on line lil-lil of Figure 8. l

Figure 11 is a detail cross section showingk a modified form of a perforating die element.

Figure l2 is a top plan View of a pinliing blade.

Figure 13 is an enlarged `cross section taken on'.

- drawings, I0 indicates a steel sliding plate having the usual handle il by means of which said plate can be manipulated and moved into and out of the flat press machine. This plate is similar to the base plate now generally used for this type of Work. The die, unit l2 is removably positioned on this plate I0. Heretoiore this plate was an integral part of the die and a separate Vplate had to be provided for each die. In my construction, one plate I8 can be used with any number of die units. This not only reduces the cost of the die but also reduces the weight thereof and permits more efficient storing of the device.`

The die unit comprises a wooden base i4, a die element l5, a rubber stripper or work support i6, and a gauge or work guide l1.

The base I4 is preferably made of plywood but can be made of fiber, composition or any other suitable material. The underside of this base is formed with upwardly extending bores i8 which are adapted torec'eive a pair of pins I9. fixed to and projecting upwardly from base plate itl. Pins I9 hold the base M in proper position'on plate Ill and prevent relative lateral movement of said parts, but at the same time permit removal of said base in an upward direction. Preferably base I4 is of the same area as plate llil and the forward end of said. base is formed in its'bottom with two recesseslll forv receiving the ends Ila of handle Il.l These ends are .disposed on the upper face of plate land are'secured'thereto Cil in any suitable manner, such as rivets 2l. A resilient nger or spring 22 is fixed to the underside of plate ID and yieldably engages a recess I4a in the forward edge of base I4 and locks the latter against accidental disengagement from plate Ill, especially when the assembly is carried by handle II. The spring member 22 is preferably countersunk in the underside of plate I0 so that the lower face thereof is smooth and lies at on the bed A of the flat press. The plate I0 is slidably positioned on said bed and guides or rails B xed to said bed engage the sides of plate I0 and help to locate it properly in the press.

The rubber stripper I6 is secured to the upper face of base I4 and is coextensive therewith. Preferably it is made of rubber sponge of a suitable density and of a predetermined thickness to provide the required resiliency. 'I'he upper face of this member IG is iinished rough so that it provides a secure hold for the work or leather piece placed thereon and prevents it from sliding on said support.

The die element I5 is, in the instant case, in the form of a strip bent into proper shape. It is embedded in a saw curve or slot 24 formed in base I4 which slot is of a shape corresponding to the bent form of said blade. This blade extends upwardly past said base I4 and the upper cutting edge I5a terminates just below the upper face of the resilient support or stripper I6.

'I'he gauge Il is formed of a at piece of fiber or metal, such as aluminum, and lies on top of the sponge member I6 rearwardly of the die element I5. The forward edge Ila of the gauge is suitably shaped to t the corresponding edge of the leather piece to be trimmed or perforated. The gauge has xed thereto iush with its upper face the upper ends 25 of a pair of spaced-apart pins 26 which extend downwardly through apertures 21 formed in rubber piece I6 into bores 28 formed vertically in block or base I4. These pins hold the gauge in proper relation to the die element I 5 and also permit the gauge to move in a vertical plane relatively to the base I4, when the die is in the press.

If desired, more than one pair of apertures 2l' and bores 28 can be provided so that the gauge I1 can be moved to a number of positions with respect to the die element I5. The gauges are interchangeable so that any gauge can be used with any base I4. Where a right and left gauge is required, one side of the gauge can be formed to be used with shoe trimmings for right shoes and the other side for use with shoe trimmings for left shoes, as shown in Figure 7.

In assembling the die unit together, the blade I5 is formed into the desired shape and a corresponding design is cut in the base I4 in proper relation with the bores I8 and 28. A sheet of sponge rubber of proper thickness and of a size coextensive with said base I4 is cemented to the upper face of the latter. The blade I5 is then forced into the saw cut 24 with the cutting edge I5a presented toward the rubber piece I6. The blade is driven in until the lower or square edge of said blade is flush with the underside of base I4. As the blade is of greater width than the thickness of said base, said blade will cut through the rubber piece I6.

The base I4 is detachably placed in position on the sliding plate I0 and the lower edge of the blade I5 bears against said steel plate I9, so that said blade is at all times in proper position.

The sponge rubber member I6 takes the place of the steel mask or stripper used in the present type of dies and also does away with the coiled springs. The rough finish on the upper face of member I6 serves to hold the work in position so that no clamps are required for the work.

The trimming blade I5 can be formed from a commercially available stock and therefore eliminates the expensive operation of forming the die element on a router machine. The gauge I'I moves up and down with the rubber piece I6 and by virtue of the pins entering the base I4 cannot get out of line. The base I4 and the sponge member I6 can be made of any desired thickness. In the instant case, the base is of an inch thick and the rubber piece is 1/4 inch thick, while the sliding plate is el.; of an inch thick to conform to the present form and fit in the existing type of presses.

One of the arms of handle II is provided with a screw thread, as indicated at 2S, and screwthreaded on said portion is a stop 30 and a lock nut 3I. The stop 30 is used to engage the forward edge of bed A and limit the inward move ment of the die. When the die is in position in the press with the leather piece C in place on member I6, the press is operated to bring the movable member D downwardly against the die. The member D forces the gauge downwardly against the resilient piece I6 and presses the work or leather piece C against the cutting edge of the blade, thereby severing the portion between the blade and the forward edge of the gauge. As is the usual practice, member D is provided with a lining member E of paper or other suitable material to prevent the edge of the blade from coming in contact with the face of member D.

In the modified form shown in Figures 8, 9 and 10, the base 32 is formed on its underside with a recess 34 which opens outwardly at the forward edge of said base. This recess forms a receiver for the waste material cut out by the tubular die element 35.

In Figure 11 the perforating die element 36 is formed with a concave cutting end and the waste material is removed from the top of the die.

In Figure l2 is shown a pinking blade 3l which is formed by bending the strip zigzag so as to provide a plurality or small angular portions. The blade thus formed is then bent or curved into the desired shape and is inserted into a slot 3B cut in base I4. This slot is of a Width equivalent to the distance between the crowns of the bends, and the space between the walls of the slot and the angularly disposed portions of the blade is lled with suitable material, such as plaster, to help to hold the pinking blade in proper position.

The base I4 being detachable from the sliding plate I0, the latter can be used interchangeably with various die units or bases I4. This reduces the cost of the die and also provides for better storage of the die units. The sponge rubber or stripper I6 provides proper support for the work. The upper face of said stripper I6 being finished rough it prevents sliding of the work so that no spring clips or clamps are necessary.

The base I4 is preferably made of plywood of the required thickness to prevent warping and splitting. However, the base can be made of other material suitable for the purpose.

The die element or elements are inexpensive and can be easily inserted in base I4.

My improved trimming and ornamenting die is of simple construction, light in weight, and can be economically manufactured.

. disclosed without departing from the spirit of soV my invention.

f I claim:

l. A die of the character described comprising a sliding plate adapted to be placed in a press, a. stop on said plate for gauging the movement thereof in said press, a plurality of upward projections xed to said plate, a removable base having a plurality of seats formed on its underside for receiving said projections and detachably holding said base on said plate, a resilient work support secured to the upper face of said base, and a die element fixed in base and having its upper end terminating adjacent to the upper face of said resilient work support and having.

its lower end flush with the underside of said base and bearing against said sliding plate, whereby said plate forms a rigid wear-resisting backing for said die element. Y

2. A die of the character described comprising a base, a sponge rubber member secured to the upper face thereof, a die element xed in said base and extending upwardly and having its f upper end terminating adjacent to the upper `face of said sponge rubber member, and a gauge placed on top of said sponger rubber member in a predetermined relation with said die element and in operative engagement with said base for relative movement in a vertical plane but held on its underside alplurality of apertures for ref ceiving said pins, whereby said base is removably held on said plate, said base having a vcut formed therein extending from top to bottom, a

rubber piece of suitable resiliency and thicknessv securedto the upper face of said base, a die relement positioned in said cut of said base and having its upper end terminating adjacent to the upper face of said rubber piece, andv having its lower end bearing against said plate, whereby the latter forms a rigid backing for saidA die element, andmeans for locking said base to said sliding plate to prevent accidental displacement.

4. A die of the character described comprising a base formed of .plywood of suitable thickness, a sponge rubber member of suitable thickness secured to the upper face of said base, a die element Xed in said base and extending upwardly therefrom and terminating adjacent to the upper face of said sponge rubber piece, a gauge placed on top of said sponge rubber piece in a predetermined relation with said die element, and means on said gauge having sliding engagement with said base to permit movement of said gauge in a vertical plane only.

5.r A trimming die comprising in combination with a sliding plate, of a wooden base resting on said plate and having a slot cut therein interlocking projections and recesses formed on the opposed faces of said plate and base for holding the latter against lateral movement on said plate, a sponge rubber work support member secured to the upper face of said base, a trimming blade inserted in said slot and extending upwardly therefrom and terminating adjacent to the surface of said work support member, and a gauge resting on top of said work support member in xed relation with said blade. I 6. A trimming die comprising in combinatie with a sliding plate, of a plurality of pins fixed thereon and projecting upwardly va wooden base, a plurality of downwardly presented bores in its underside for engaging said pins, whereby said base is held against lateral movement but is re` movable upwardly, said base being of suitabley a cut formed therein corresponding with the cut of said base, a trimming blade bent into proper shape and forced into said cut and having its upper cutting edge terminating adjacent to the base of said resilient work support member, and a gauge resting on said work support in spaced relation with said blade and movable in a vertif cal planev only.

7. A trimming die comprising in combination with a sliding plate, of a plurality of pins xed thereon and projecting upwardly a wooden base, a plurality/ of downwardly presented bores in its underside for engaging said pins, whereby said base is held against lateral movement but is removable upwardly, said base being of suitable thickness and provided with a saw cut corresponding in size and shape to the trimmed cut to bemade, ra resilient work support member secured to the upper face of said base and having a cut formed therein corresponding with the cut of said base, a trimming blade bent into proper shape and forced into the cut of said base and having itS upper cutting edge terminating adjacent to the' base of said resilient work support member, and having its lower edge terminating ushl with the underside of said base, and a steel plate engaging the underside' of said base and supporting the lower end forming a rigid support for the lower edge of said blade, whereby said steel plate forms a firm, non-yielding backing for said trimming blade. n

8. A device of the character described com prising a base, al rubber stripper and work support secured to the upper face of said base, a die element Xed to said base and having its upper end terminating adjacent to the face vof said work support, and a gauge resting on top of said work support in xed relation with said die element and slidably mounted in said base for movement in a vertical plane.

9. A device of the class described comprising a base, a sponge rubber work support secured to the upper face of said base, a die elementxed to said base and having its upper end terminating adjacent to the face of said work support, a gauge resting on top of said work support in fixed relation with said die element, and means xed to said gauge and slidably mounted in said base for movement in a VerticalV plane only.

10. A device of the class described comprising a base, a sponge rubber work support secured to the upper face of said base, a die element fixed to said base and having its upper end terminating adjacent to the face of said work support, a gauge resting on top of said work support in kfixed relation with said die element, and means for removably and reversibly mounting said gauge in said base.

FREDERICK G. KURTZEBORN. 

